duplication_in_block.rb

def method_one(&block)
  puts "method_one"
  block.call
end

def method_two(&block)
  puts "method_two"
  block.call
end

def complex(cond, &block)
  if cond
    method_one do
      block.call
    rescue => e
      puts e
      raise
    end
  else
    method_two do
      block.call
    rescue => e
      puts e
      raise
    end
  end
end


complex(true) { puts "here run"; raise "one" }
complex(false) { puts "here run"; raise "two" }

extracted_duplicated_block.rb

def method_one(&block)
  puts "method_one"
  block.call
end

def method_two(&block)
  puts "method_two"
  block.call
end

def complex(cond, &block)
  rblock = Proc.new do
    block.call
  rescue => e
    puts e
    raise
  end

  if cond
    method_one &rblock
  else
    method_two &rblock
  end
end


complex(true) { puts "here run"; raise "one" }
complex(false) { puts "here run"; raise "two" }